1.
A sample of well water contains 140 gm/m3 Ca2+ ions and 345 gm/m3 Na+ ions. The hardness of the sample of water, expressed in terms of equivalent CaCO3 in gm/m3 is (assuming atomic masses of Ca : 40, Na : 23, C : 12, O : 16)

2.
The molecules of a liquid which is in equilibrium with its vapor at its boiling point on an average have equal __________ in the two phases.

4.
Which of the following holds good for a solution obeying Raoult's law (i.e., an ideal solution) (where, ΔH = heat of mixing, and ΔV = volume change on mixing ) ?

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